JP4848635B2 - Video display device - Google Patents

Description

  The present invention relates to a video display device, and more particularly to a video display device that displays a video signal output from a personal computer.

  2. Description of the Related Art Conventionally, as a video display device capable of receiving a personal computer signal, one disclosed in JP-A-10-198302 is known.

  FIG. 3 shows a configuration of a conventional video display apparatus. In FIG. 3, 31 is an A / D conversion circuit for converting an analog RGB video signal of an input signal into a digital RGB signal, and 33 is an input signal. A synchronization separation means 32 for separating and outputting a horizontal synchronization signal and a vertical synchronization signal from a signal, and a scan conversion circuit 32 for converting an input signal to a desired resolution. The scan conversion circuit 32 uses, for example, a horizontal pixel number conversion circuit disclosed in Japanese Patent Laid-Open No. 9-247588 for horizontal conversion, and a scan line conversion device disclosed in Japanese Patent Laid-Open No. 9-247574 for vertical conversion. Can be realized. 34 is a PLL circuit that generates sampling clocks for the A / D converter 3 and the scan conversion circuit 32, 36 is a memory device for storing information necessary for conversion, 35 is a control circuit, and is a horizontal synchronization signal, vertical While the horizontal frequency and the vertical frequency are detected from the synchronization signal, data relating to resolution conversion is read from the memory device 36, and the PLL circuit 34 and the scan conversion circuit 32 are set.

  Next, the operation of the conventional video display apparatus configured as described above will be described. From the input video signal, a horizontal synchronization signal and a vertical synchronization signal are extracted from the synchronization separation means 33 and input to the control circuit 35. The control circuit 35 to which these synchronization signals are input first detects the horizontal frequency and vertical frequency of the input signal from the horizontal synchronization signal and the vertical synchronization signal. The scan conversion rate is determined from the horizontal frequency and the vertical frequency assuming a signal source existing in the market, and is output to the scan conversion circuit 32 and the PLL circuit 34 to be received on the display medium. As described above, the input signals are roughly classified into signals existing in the market and processed and do not completely match the resolution and position of the input video signal. For this reason, the user adjusts the angle of view adjustment data such as the frequency adjustment of the sampling clock and the enlargement ratio setting of the scan conversion circuit by the angle of view correction selection means 37 to obtain a normal display position. Here, the data adjusted by the user is stored in the memory device 36 in association with the input synchronization frequency, and when the same signal is input next time, the data is adjusted normally using the information in the memory device 36 without adjustment. It is to receive an image.

On the other hand, WIDE type products such as WVGA (862 × 480) and WXGA (1366 × 768) are increasing in the market recently. Many of these signals have a synchronization frequency of the same frequency as that of a non-wide type VGA or XGA, and are often indistinguishable from normal XGA / VGA.
Japanese Patent Laid-Open No. 10-198302 JP-A-9-247588 Japanese Patent Laid-Open No. 9-247574

  In this conventional video display device, the data of the size adjustment by scan conversion and the frequency adjustment of the sampling clock are associated with the synchronization frequency of the input video signal as shown in FIG. However, as with some XGA signals and WXGA signals, when signals with the same synchronization frequency and different resolutions are adjusted, when either one is adjusted, the other signals are re-received. Adjustment is required.

  In order to obtain optimal resolution conversion and video display position settings for several types of video signals with the same synchronization period and different resolutions, the present invention re-scans scan conversion information such as video position every time the input signal changes. An object is to obtain a normal image display position / size by a simple switching operation without setting.

  In order to solve this problem, the present invention makes it possible to store n kinds of field angle settings for one combination of arbitrary horizontal and vertical synchronization frequencies held by an input video signal, and n kinds of field angle settings. Are configured to be able to be switched at once by a simple operation.

  As a result, for several types of video signals with the same synchronization period and different resolutions, optimal resolution conversion and video display position settings can be stored for each signal, so that every time the input signal changes A normal angle of view can be obtained with a simple switching operation without resetting scan conversion information such as position.

  According to the first aspect of the present invention, n kinds of field angle settings can be stored for one combination of arbitrary horizontal and vertical synchronization frequencies held by an input video signal, and the n kinds of image signals are stored. It is characterized by having a corner setting switching means, and for several types of video signals with the same synchronization period and different resolutions, optimal resolution conversion and video display position settings are stored for each signal. In this way, the stored information is easily switched.

  According to a second aspect of the present invention, there is provided a synchronization separation circuit that separates synchronization of input video and outputs horizontal and vertical synchronization signals, an A / D conversion circuit that converts an input video signal into digital, and the A / D A scan conversion circuit that converts the output of the conversion circuit to a desired resolution, a PLL circuit that generates a sampling clock of the A / D converter and the scan conversion circuit, and information necessary for conversion by the scan conversion circuit horizontally and vertically A memory device that stores n types of combinations of synchronization frequencies, and a horizontal frequency and a vertical frequency are detected from a horizontal synchronization signal and a vertical synchronization signal, while data related to resolution conversion is read from the memory device, and the PLL circuit and A control circuit for setting the scan conversion circuit, and an angle-of-view correction selecting unit for selecting one of n types of information necessary for conversion in the memory device. The video display device according to claim 1, comprising: a plurality of video signals having the same synchronization period and different resolutions, each having an optimum resolution conversion and video display position setting for each of the signals. And the accumulated information is easily switched.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

(Embodiment 1)
FIG. 1 shows the configuration of the first embodiment of the present invention. In FIG. 1, 11 is an A / D conversion circuit for converting an analog RGB video signal of an input signal into a digital RGB signal, and 13 is a synchronization separation that separates and outputs a horizontal synchronization signal and a vertical synchronization signal from the input signal. Means 12 is a scan conversion circuit for converting the input signal to a desired resolution. Reference numeral 14 denotes a PLL circuit that generates sampling clocks for the A / D converter 3 and the scan conversion circuit 12. Reference numeral 16 denotes a memory device for storing the horizontal frequency, vertical frequency and angle of view adjustment data of the video signal. A control circuit 15 detects the horizontal frequency and the vertical frequency from the horizontal synchronization signal and the vertical synchronization signal, and reads data relating to resolution conversion from the memory device 16 to set the PLL circuit 14 and the scan conversion circuit 12. To do. Reference numeral 17 denotes a remote control receiver. Reference numeral 18 denotes a means for selecting one when a plurality of data are found by searching the memory device 16 based on the horizontal frequency and vertical frequency of the input video signal, and an angle of view. And a means for inputting adjustment data to the video display device. However, the angle of view adjustment data is data for setting the video signal to the size and position of the video according to the video display device, including the adjustment of the scan conversion rate, the adjustment of the sampling clock frequency, and the display section of the video signal. And various adjustment data related to phase data.

  Next, regarding the video display device of the present invention configured as described above, the combination of the horizontal frequency and the vertical frequency in the memory device 16 is compared with the video signal input to the video display device, and the input video signal is determined as one. The operation in the case of being specified by one video format will be described. From the input video signal, a horizontal synchronization signal and a vertical synchronization signal are extracted from the synchronization separation means 13 and input to the control circuit 15. The control circuit 15 to which these synchronization signals are input detects the horizontal frequency and the vertical frequency of the input signal from the horizontal synchronization signal and the vertical synchronization signal. The memory device 16 is searched based on the horizontal frequency and the vertical frequency to determine the scan conversion rate, and is output to the scan conversion circuit 12 and the PLL circuit 14 to be received on the display medium. As described above, the input signal is processed based on a commonly used video signal format stored in the memory device 16, and does not completely match the resolution and position of the input video signal. . For this reason, the user transmits angle adjustment data such as sampling clock frequency adjustment and enlargement ratio setting of the scan conversion circuit to the remote control receiver 17 using the remote controller 18. The receiving unit 17 transmits the received view angle adjustment data to the control circuit 15. The control circuit 15 transmits a control signal to the PLL circuit 14 and the scan circuit 12 based on the received view angle adjustment data. The PLL circuit 14 adjusts the sampling clock frequency based on the control signal, and inputs the adjusted sampling clock to the A / D conversion circuit 11 and the scan adjustment circuit 12. As a result, the input video signal is adjusted to obtain a normal display position. The angle of view adjustment data is stored in the memory device 16 together with the horizontal frequency and the vertical frequency.

  Next, the combination of the horizontal frequency and the vertical frequency in the memory device 16 and the video signal input to the video display device are compared, and the case where the input video signal is specified by two video signal formats will be described. In this embodiment, in order to simplify the description, a case where WXGA or XGA having the same synchronization frequency is input will be described as an example. Further, the resolution of the display medium (here, liquid crystal) is 1024 × 768. First, in the case of an XGA signal, the resolution (effective area) of the input signal is 1024 dots × 768 lines, and the total number of dots within 1H including the blanking period is 1344 dots. When an XGA signal is input as an input video signal, the XGA signal is input to the synchronization separation unit 13, and a horizontal synchronization signal and a vertical synchronization signal are extracted and output to the control circuit 15. The control circuit 15 detects the horizontal frequency fh and the vertical frequency fv of the input signal from the horizontal synchronization signal and the vertical synchronization signal, and outputs them to the memory device 16. The memory device 16 searches for data based on the horizontal frequency fh and the vertical frequency fv. The video display device informs the user through the display medium that the video signal is XGA or WXGA based on the search result of the memory device 16. The user selects XGA using the remote controller 18. Then, the horizontal size (enlargement ratio) is set as shown in (Equation 1).

  The frequency (fd) adjustment of the sampling clock is adjusted as shown in (Equation 2).

  In addition to this, the user uses the remote controller 18 to adjust the vertical enlargement ratio and the video position information. As a result, the input video signal obtains a normal display position. On the other hand, the field angle adjustment data is stored in the memory device 16 together with the horizontal frequency and the vertical frequency. Here, the data structure in the memory device 16 is as shown in FIG. 2, and the horizontal frequency, vertical frequency, and field angle adjustment data are stored in the “field angle setting information A-1”. With the above adjustment, the user can obtain an optimal display position. When the same signal is input next time, an optimal display position is obtained without adjustment by selecting “viewing angle setting information A-1” displayed on the display medium with the remote controller 18.

  Next, a case where a WXGA signal is input will be described. In the case of a WXGA signal, the resolution (effective area) is 1366 dots × 768 lines, and the total number of dots in 1H including the blanking period is 1792 dots. First, when a WXGA signal is input as an input video signal, the WXGA signal is input to the synchronization separation unit 13, and a horizontal synchronization signal and a vertical synchronization signal are extracted and output to the control circuit 15. The control circuit 15 detects the horizontal frequency fh and the vertical frequency fv of the input signal from the horizontal synchronization signal and the vertical synchronization signal, and outputs them to the memory device 16. The memory device 16 searches for data based on the horizontal frequency fh and the vertical frequency fv. The video display device informs the user through the display medium that the video signal is XGA or WXGA based on the result of searching the memory. The user uses the remote controller 18 to select WXGA. Then, the horizontal size (enlargement ratio) is set as shown in (Equation 3).

  The frequency (fd) of the sampling clock is adjusted as shown in (Equation 4) because the input fh is the same as that of the XGA described above.

  In addition to this, the user adjusts the vertical enlargement ratio and the video position information using the remote controller 18, and the horizontal frequency, the vertical frequency and the angle of view adjustment data are stored in the memory device 16. When accumulating in the device 16, it is detected that the same synchronization frequency data “view angle setting information A-1” is already held and the same synchronization frequency data exists, and the above WXGA The data is stored in “view angle setting information A-2”.

  Through the above adjustment, an optimal display position is obtained, but when the same signal is input next time, the user can view “view angle setting information A-1” and “view angle setting information A-2” through the display medium. Is stored in the memory device 16 and the remote control 18 is operated to easily switch the angle-of-view adjustment data. As a result, the user can display the input video signal at the optimal video position. At this time, it is possible to further improve the operability at the time of the next image reception by announcing that the user has accumulated in another area by using character information such as on-screen.

  In the present embodiment, the remote control receiving unit 17 and the remote control 18 are used as the angle of view correction value selection means. However, the present invention is not limited to this. For example, the adjustment may be performed using buttons or switches provided in the video display device.

  In the present embodiment, the display medium is used as means for notifying the user of data related to the memory device 16, but the present invention is not limited to this. For example, a video display device may be provided with a speaker and notified by sound.

  In this embodiment, the horizontal frequency and vertical frequency of the video signal are stored in advance in the memory device 16, but the horizontal frequency and vertical frequency of the video signal are stored in another memory and actually adjusted. The horizontal frequency and vertical frequency of the video signal and the angle of view adjustment data may be stored in the memory device 16.

  Further, an OSD (On Screen Display) signal synthesizer may be installed in the video display device in order to display the search result of the memory device 16 on the display medium.

  In this embodiment, there are two combinations of the same horizontal frequency and vertical frequency in the memory device 16 for storing the horizontal frequency, vertical frequency and angle-of-view adjustment data of a video signal of a format generally used. However, it is not limited to two types, and two or more types can have the same combination of horizontal frequency and vertical frequency.

  In this embodiment, the video signal is selected when a new video signal is input. However, the selection timing may be set arbitrarily as well as that time. Alternatively, the user may search the memory device 16 at a desired time using input means such as the remote controller 18 and select the view angle adjustment data.

  As described above, according to the present invention, the optimal resolution conversion and video display position setting can be stored for each signal for several types of video signals having the same synchronization period and different resolutions. There is an advantageous effect that a normal angle of view can be obtained by a simple switching operation without resetting the scan conversion information such as the video position every time the signal changes.

The block diagram which shows the video display apparatus by one embodiment of this invention Arrangement | positioning figure of the view angle correction information in the memory | storage means in one embodiment of this invention Configuration diagram showing a conventional video display device Arrangement diagram of angle of view correction information in storage means in conventional video display device

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 A / D conversion circuit 12 Scan conversion circuit 13 Synchronization separation means 14 PLL circuit 15 Control circuit 16 Memory device 17 Remote control receiver 18 Remote control 31 A / D conversion circuit 32 Scan conversion circuit 33 Synchronization separation means 34 PLL circuit 35 Control circuit 36 Memory device 37 angle of view correction selection means

Claims (1)

A sync separation circuit for synchronizing and separating an input video signal and outputting a horizontal sync signal and a vertical sync signal ;
An A / D conversion circuit for converting an input video signal to digital;
A scan conversion circuit for converting the output of the A / D conversion circuit to a desired resolution ;
A PLL circuit that generates a sampling clock frequency of the A / D conversion circuit and the scan conversion circuit;
A memory device that stores a plurality of types of angle-of-view adjustment data that is data relating to resolution conversion including data relating to scan conversion rate, sampling clock frequency, video signal display interval, and phase data for each set of horizontal frequency and vertical frequency ; ,
When a set of horizontal frequency and vertical frequency detected by a control circuit to be described later is stored in the memory device, one of a plurality of types of angle adjustment data corresponding to the set of horizontal frequency and vertical frequency is selected. An angle-of-view correction selection means for the user to select one angle-of-view adjustment data,
A set of horizontal frequency and vertical frequency is detected from a set of horizontal sync signal and vertical sync signal which are the outputs of the sync separation circuit, and based on one view angle adjustment data selected by the view angle correction selection means. A control circuit for setting the PLL circuit and the scan conversion circuit;
A video display device.

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